Finding the Third Proportional to 489,298.50 and 689,046

Step by Step Solution

1. Step 1: Write the proportion equation
   489,298.50 : 689,046 = 689,046 : x
2. Step 2: Convert to fraction form
   489,298.50/689,046 = 689,046/x
3. Step 3: Cross multiply
   489,298.50x = 689,046 × 689,046
4. Step 4: Simplify right side
   489,298.50x = 474,784,390,116
5. Step 5: Solve for x
   x = 474,784,390,116/489,298.50
6. Step 6: Final answer
   x = 970,336.90